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DLP4500: DLP4500EMV's Patterns storage too small

Qilin Sun
Prodigy 20 points
Part Number: DLP4500
Other Parts Discussed in Thread: DLPC350

I bought one DLP4500 EMV， but the onboard FLASH memory is only 32Mb. Now we need to display around 600 binary patterns and the frame rate is around 0.5Hz.  By the way, the pattern has to be triggered using external trigger signal. The mini HDMI port seems only support from 10Hz to 120Hz. Do you have any solution for solving this problem? Is it possible to change the FLASH chip on the board into a large one?  Or can we using a external FLASH for the board? Thank U very much

  • 0
    TI__Mastermind 30600 points
    Hi Qilin,

    Sorry for the delay - it was a holiday weekend here in the US.

    For the DLPC350 based platforms, there is a memory size limitation, which is 32MB (not Mb) which is what is currently on the Lightcrafter 4500.

    From what you have described, I would recommend looking at using the Video input with Pattern Sequences. In this case, each VSYNC is the external trigger and you can have your pattern display for up to the VSYNC period. In this mode, slow frame rates should be okay. You'll need some type of controllable video source and a method for feeding your patterns sequentially over video.

    Take a look at section 3.3 in the user's guide: www.ti.com/.../dlpu011e.pdf

    Thanks,
    Paul
  • 0
    Prodigy 20 points
    Hi Qilin,

    You may want to take a look at the LC4500-PEM solution from Keynote Photonics. We created it for just this type of application where you need to stream large numbers of patterns. It combines the functionality of the LC4500 EVM from TI with a Pattern Expansion module which is a BeagleBone Single Board Computer running our own embedded application that provides pattern storage and synchronication with the LC4500. It is essentially a "controllable video source" that you can communicate with over Ethernet or USB. You can get more information on our website here:

    www.keynotephotonics.com/.../

    If you want even more information or purchasing information, just click on the "Contact us" link at the bottom of that page.

    Best Regards,

    James Headley
    Keynote Photonics Inc.